"add one solar day" doesn't work when you're on the Sun

[Paul McCudden]

Incrementing time (by one solar day, one sidereal day, etc.) doesn't seem to work when you go to the Sun and look at the Earth. The "=" key doesn't do anything, and "alt-=" key changes the time by some strange amount - a few weeks?

[Alexander Wolf (alexwolf)]

Solar day on the Sun do not have physical meaning and we can use zero for it. Sidereal rotation period at equator of the Sun is 25.05 days (34.4 days at poles and 25.38 days at 16° latitude). You are right, we should use this data (duration at equator I guess) for Sun's sidereal days.

[Alexander Wolf (alexwolf)]

Right now Sun's sidereal day has duration of 27,3 days. Solar day I'll set to zero.

[Paul McCudden (pjm-90041)]

I use Stellarium in an Astronomy class I teach, and have the students
watch the Earth from the Sun and let one solar day (24 hours) pass at a
time so they can see the Earth's tilt (and the sub solar point) changing
as the seasons change day by day. It would be great to reactivate the
"=" key when you are on the Sun, even if it has no physical meaning.
Thanks.

______________________
Paul McCudden
Los Angeles, CA
<email address hidden>
______________________

On 10/8/2013 8:27 AM, Alexander Wolf wrote:
> Solar day on the Sun do not have physical meaning and we can use zero
> for it. Sidereal rotation period at equator of the Sun is 25.05 days
> (34.4 days at poles and 25.38 days at 16° latitude). You are right, we
> should use this data (duration at equator I guess) for Sun's sidereal
> days.
>
> ** Changed in: stellarium
> Assignee: (unassigned) => Alexander Wolf (alexwolf)
>
> ** Changed in: stellarium
> Status: New => Confirmed
>
> ** Changed in: stellarium
> Importance: Undecided => Low
>

[Paul McCudden (pjm-90041)]

I use Stellarium in an Astronomy class I teach, and have the students watch the Earth from the Sun and let one solar day (24 hours) pass at a time so they can see the Earth's tilt (and the sub solar point) changing as the seasons change day by day. It would be great to reactivate the "=" key when you are on the Sun, even if it has no physical meaning. Thanks.

[Alexander Wolf (alexwolf)]

Diff: http://bazaar.launchpad.net/~stellarium/stellarium/trunk/revision/6290